Classify triangle abc by its sides if side ab = 6x, side ac = 4x + 6 and side bc = 8x + 3. the perimeter of triangle abc is 63. show all your work

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?